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Three-level energy storage current transformer

An energy storage converter, three-level technology, applied in the direction of regulating electrical variables, instruments, converting DC power input to DC power output, etc., can solve the problem of suppressing uneven load voltage, low utilization rate, no four-quadrant operation, current ripple bigger problems

Active Publication Date: 2014-12-31
SHANGHAI ELECTRICGROUP CORP
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AI Technical Summary

Problems solved by technology

[0003] In traditional energy storage system circuits, a four-wire system (that is, four bridge arms) is generally used to meet the complex requirements of three-phase loads and single-phase loads; There is no four-quadrant operation capability, and the current ripple of the DC-DC (DC / DC) module is relatively large, which seriously affects the stability of the energy storage system

Method used

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Embodiment Construction

[0038] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0039] Such as figure 1 As shown, a three-level energy storage converter includes an energy storage unit, a T-shaped three-level four-arm DC / AC unit is electrically connected to the energy storage unit through a feedback type three-level DC / DC unit ; And the above-mentioned T-type three-level four-arm DC / AC unit is also electrically connected to the load through a filter; specifically:

[0040] The above-mentioned energy storage unit can be a battery pack (such as a battery pack, etc.) for storing or releasing electric energy, and the energy storage unit can also be a solar power generation system (ie, a solar array substrate), a wind power generation system or other similar DC The power generation system can be used as long as it can store and / or release electrical energy, that is, the storage module has a function of releasing electrical energy...

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Abstract

The invention provides a three-level energy storage current transformer, and relates to the technical field of power electronics. A feedback three-level DC / DC (direct current to direct current) unit is adopted, so the three-level energy storage current transformer provided by the invention has a four-quadrant operation function, and during point voltage stabilization in a direct current filter capacitor, the system efficiency can also be improved. Through the arrangement of a three-level circuit in staggered parallel connection, the current ripple at the direct current side can be greatly reduced. In addition, a fourth bridge arm in a T-shaped three-level four-bridge-arm DC / AC (direct current to alternating current) unit in the three-level energy storage current transformer is not connected with a midpoint of the direct current filter capacitor, so the voltage utilization rate of a system can be further improved, and meanwhile, the unbalanced voltage caused by unbalanced load can be effectively inhibited.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-level energy storage converter. Background technique [0002] At present, with the development of technology and the progress of society, people's demand for energy is getting higher and higher, especially the development and utilization of clean energy (such as photovoltaic power generation, wind power generation and hydropower generation, etc.), which has attracted more and more attention. . [0003] In traditional energy storage system circuits, a four-wire connection (that is, four bridge arms) is generally used to meet the complex requirements of three-phase loads and single-phase loads at the same time; however, the voltage utilization rate of suppressing uneven loads is low, and There is no four-quadrant operation capability, and the current ripple of the DC-DC (DC / DC) module is large, which seriously affects the stability of the energy storage system. Summary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M3/155H02M7/483
Inventor 李霄陈海滨汤雪华唐丽婵叶辰之张霞鲍立成胡晓羽
Owner SHANGHAI ELECTRICGROUP CORP
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